CN110043515A - A kind of cooling fan of low harmony wave noise - Google Patents
A kind of cooling fan of low harmony wave noise Download PDFInfo
- Publication number
- CN110043515A CN110043515A CN201810035956.3A CN201810035956A CN110043515A CN 110043515 A CN110043515 A CN 110043515A CN 201810035956 A CN201810035956 A CN 201810035956A CN 110043515 A CN110043515 A CN 110043515A
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- China
- Prior art keywords
- guide vane
- cooling fan
- group
- flabellum
- blade
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Present disclose provides a kind of cooling fan of low harmony wave noise, which includes: flabellum, which includes seven blades in non-uniform Distribution；Stator blade, the stator blade are configured such that flabellum can be rotated relative to stator blade.The cooling fan is configured to: stator blade includes first group of guide vane and second group of guide vane, wherein each group of guide vane in first group of guide vane and second group of guide vane all has equally distributed four guide vanes, and second group of guide vane is deflected relative to first group of guide vane with the guide vane deflection angle between 26 ° to 28 °.Discrete noise is effectively reduced in the cooling fan on the whole, to improve the driver comfort of automobile.
Description
Technical field
This disclosure relates to cooling fan, the cooling fan reduced more particularly, to harmonic noise.
Background technique
Automobile engine cooling fan is widely used in car engine cooling system.The rotation that cooling fan passes through itself
Turn to deliver air to the condenser radiator of automobile engine and take away the heat generated when engine operation, to guarantee to send out
Motivation works at a suitable temperature.
In general, automobile engine cooling fan includes flabellum, stator blade and motor, flabellum is mounted on motor and motor is pacified
On stator blade, wherein flabellum includes the multiple blades being distributed in mode in a certain angle each other, and stator blade includes with that
Multiple guide vanes that mode in a certain angle is distributed between this.At work, electrical power and drive flabellum rotation to generating
Air flowing, air stream is then by keeping the stator blade in stationary state.
But while cooling fan generates air flowing by rotation, also causes the disturbance of air-flow and the not phase occur
The harmonic noise of prestige causes the driver comfort of automobile to deteriorate.There are many harmonic noise Producing reasons of cooling fan, such as
The distribution angle of flabellum blade, the interference of flabellum and stator blade, uniformity of air inlet etc. may have an impact harmonic noise.Wind
When periodically striking air particle, the harmonic components that all flabellum blades strike air particle and generate often concentrate on fan
Certain specific orders form such as first harmonic of low order time, the intermediate second harmonic of order and the third harmonic of high order.
Therefore, it is desirable to research and develop a kind of cooling fan that can reduce harmonic noise.
Summary of the invention
The disclosure is designed to provide a kind of cooling fan that harmonic noise reduces, to improve the driving comfort of automobile
Property.
An aspect of this disclosure provides a kind of cooling fan, which includes: flabellum, which includes in non-equal
Seven blades of even distribution；And stator blade, the stator blade are configured such that flabellum can be rotated relative to stator blade.The cooling fan quilt
Be configured to: stator blade includes first group of guide vane and second group of guide vane, wherein each group in first group of guide vane and second group of guide vane is led
Leaf all has equally distributed four guide vanes, and second group of guide vane relative to first group of guide vane between 26 ° to 28 °
The deflection of guide vane deflection angle.
In the cooling fan according to the above-mentioned aspect of the disclosure, second group of guide vane is relative to first group of guide vane with 27 °
The deflection of guide vane deflection angle.
In the cooling fan according to the above-mentioned aspect of the disclosure, flabellum includes seven blades in non-uniform Distribution, and
And eight guide vanes for by stator blade including are divided into two groups, every group of guide vane includes equally distributed four guide vanes, and two groups of guide vanes with
Guide vane deflection angle deflection between 26 ° to 28 °.By making flabellum include seven blades in non-uniform Distribution, regulation
The circumferentially distributed position of flabellum blade, so that the angle between flabellum blade is in non-uniform Distribution, thus change phase angle,
Guarantee that the noise generated when cooling fan rotation is not superimposed in a harmonic order, harmonic components is promoted to be transferred to other orders
On, thus reduce harmonic noise.On this basis, it is based on stator blade guide vane dipole sound radiant theory, establishes leading for two groups of guide vanes
Relationship between leaf deflection angle and harmonic noise amplitude, and then by making two groups of stator blade guide vanes with suitable guide vane deflection angle
(every group includes 4 guide vanes) deflects relative to each other to decay to the amplitude of target harmonic noise.
By the cooperation of above-mentioned arrangement, first harmonic, second harmonic and third harmonic three can be effectively reduced simultaneously
Noise, so that the noise of cooling fan be effectively reduced on the whole.Therefore, in the cooling fan according to the above-mentioned aspect of the disclosure
In, the stator blade of cooling fan, which not only serves, to be supported and fixed, but also is cooperated with the flabellum blade of non-uniform Distribution to reduce
Harmonic noise.
The angle between two neighboring blade in the cooling fan according to the above-mentioned aspect of the disclosure, in seven blades
61.2 ° ± 1 °, 37.3 ° ± 1 °, 47.9 ° ± 1 °, 67.1 ° ± 1 °, 47.9 ° ± 1 °, 37.3 ° ± 1 ° and 61.2 ° can be followed successively by
±1°。
In the cooling fan according to the above-mentioned aspect of the disclosure, guide vane can have round, ellipse, rectangle or diamond shape
Iso-cross-section shape, and can be in U-shape, the hollow or forms such as solid.
In the cooling fan according to the above-mentioned aspect of the disclosure, blade can have symmetrical airfoil, biconvex profile, plano-convex
The aerofoil profiles such as aerofoil profile, concave-convex aerofoil profile, flat profile or arc plate aerofoil profile.
In the cooling fan according to the above-mentioned aspect of the disclosure, blade can be with or without integral shroud.
In the cooling fan according to the above-mentioned aspect of the disclosure, flabellum can be made of metal material or plastic material,
Metal material includes one of metallic elements such as iron, aluminium, magnesium, copper or a variety of alloys, and plastic material includes poly- terephthaldehyde
Sour butanediol ester (PBT), polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) (ABS) or polypropylene (PP) etc..In view of system
This is caused, flabellum can preferably be made of plastic material.
In the cooling fan according to the above-mentioned aspect of the disclosure, stator blade can be made of metal material or plastic material,
Metal material includes one of metallic elements such as iron, aluminium, magnesium, copper or a variety of alloys, and plastic material includes poly- terephthaldehyde
Sour butanediol ester (PBT), polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) (ABS), polypropylene (PP) etc..In view of system
This is caused, stator blade can preferably be made of plastic material.
By the cooling fan according to the above-mentioned aspect of the disclosure, it can use and deflected each other with suitable guide vane deflection angle
Two groups of stator blade guide vanes (every group include 4 guide vanes) arrangement, to further decrease the noise of cooling fan, to effectively improve
The driver comfort of automobile.
Another aspect of the disclosure provides a kind of car engine cooling system, which includes
According to the cooling fan of the above-mentioned aspect of the disclosure.
The arrangement of the flabellum blade of the disclosure can be applied to the flabellum with various wheel hub ratios, correspondingly, the disclosure
The arrangement of stator blade guide vane can be applied to the stator blade with various wheel hub ratios.This public affairs can be also applied in the design of other turbine types
The arrangement of the flabellum blade and stator blade guide vane opened, as long as stator blade guide vane is located at the downstream of flabellum blade.
Detailed description of the invention
The feature and advantage of the disclosure are described in detail below with reference to the accompanying drawings, wherein identical appended drawing reference indicates identical
Element, in the accompanying drawings:
Fig. 1 is the structural schematic diagram of prior art cooling fan；
Fig. 2 a is the schematic diagram of the flabellum of the cooling fan in Fig. 1；
Fig. 2 b is the schematic diagram of the stator blade of the cooling fan in Fig. 1；
Fig. 3 is the structural schematic diagram of cooling fan according to an embodiment of the present invention；
Fig. 4 a is the schematic diagram of the flabellum of the cooling fan in Fig. 3；
Fig. 4 b is the schematic diagram of the stator blade of the cooling fan in Fig. 3；
Fig. 5 is the schematic diagram of the harmonic noise test facilities of cooling fan；
Fig. 6 is the curve graph of the harmonic noise test result of the cooling fan in Fig. 1；
Fig. 7 is the curve graph of the harmonic noise test result of the cooling fan in Fig. 3.
Specific embodiment
The disclosure is described further in the following with reference to the drawings and specific embodiments.
Fig. 1 shows prior art cooling fan 10, and wherein cooling fan 10 includes flabellum 11, stator blade 12 and motor
13, motor 13 is mounted on stator blade 12, and flabellum 11 is mounted on motor 13, and flabellum 11 can be rotated relative to stator blade 12.In electricity
When machine 13 is powered, motor 13 drives the rotation of flabellum 11 to generate air stream, and air stream is then by keeping being in stationary state
Stator blade 12.The panel 14 of cooling fan 10 is also shown in Fig. 1, which is assembled to car engine via panel 14
Around machine (not shown), and constitute a part of car engine cooling system.
As shown in FIG. 1, flabellum 11 includes seven blades 111, is equipped with (the figure of wheel hub 112 in the radial inner end of blade 111
Wheel hub 112 is more clearly illustrated in 2a).It is equipped with integral shroud 113 in the radial outer end of blade 11, blade 111 is connected to 112 He of wheel hub
Between integral shroud 113.When cooling fan 10 works, motor 13 rotates, and the wheel hub 112 being mounted on motor 13 is driven to rotate, from
And the blade 111 connecting with wheel hub 112 is promoted to rotate.Flabellum 11 will be described in detail in conjunction with Fig. 2 a.
Stator blade 12 includes eight guide vanes 121, is equipped with inner ring 122 in the radial inner end of guide vane 121, and in guide vane 121
Radial outer end is equipped with outer ring 123, and guide vane 121 is connected between inner ring 122 and outer ring 123.Outer ring 123 is connected to cooling fan
10 panel 14, thus makes stator blade 12 be fixed and remain stationary in cooling fan 10.Inner ring 122 plays fixed and keeps electricity
The effect of machine 13, and inner ring 122 is connected to outer ring 123 via guide vane 121.Stator blade 12 will be described in detail in conjunction with Fig. 2 b.
Fig. 2 a shows the flabellum 11 of the cooling fan 10 in Fig. 1.Can be seen that flabellum 11 from Fig. 2 a includes seven blades
111, this seven blade 111 is overall to be evenly distributed, i.e., the angle between two neighboring blade 111 is approximately equal to each other.
Specifically, seven blades of flabellum 11 are respectively 111a, 111b, 111c, 111d, 111e, 111f, 111g.Phase
The angle of neighbour two blades 111a, 111b refer to the radial outer end of blade 111a to center (the i.e. rotation of flabellum 11 of wheel hub 112
The intersection point of plane where shaft axis and flabellum) line, with the line of the radial outer end of blade 111b to the center of wheel hub 112 it
Between angle, the angle is indicated by α 1 in fig. 2 a.Correspondingly, the angle of two neighboring blade 111b, 111c are indicated by α 2, phase
The angle of neighbour two blades 111b, 111c are indicated that the angle of two neighboring blade 111c, 111d are indicated by α 4 by α 3, adjacent two
The angle of a blade 111d, 111e are indicated that the angle of two neighboring blade 111e, 111f are indicated by α 6, two neighboring leaf by α 5
The angle of piece 111f, 111g are indicated by α 7.By keeping α 1 to α 7 approximately equal to each other, it is evenly distributed so that blade 111 is overall,
Wherein, α 1 to α 7 is about 51.4 °.In practical applications, any one of above-mentioned angle can change in allowed limits,
For example, each of α 1 to α 7 can be 51.4 ° ± 1 °, rather than it is complete each other or utterly equal.
It is worth noting that, herein, " θ ± 1 ° " (θ is any angle) indicates the range for allowing θ at+1 ° to θ -1 ° of θ
Interior variation, but this variation should meet corresponding structural requirement, for example, allowing α 1 to α 7 for seven blades of flabellum 11
Each of change in the range of 50.4 ° to 52.4 °, but the sum of α 1 to α 7 should be 360 °.
Fig. 2 b shows the stator blade 12 of the cooling fan 10 in Fig. 1, wherein removing outer ring 123 for ease of description.?
In cooling fan 10, the number of the blade 111 of the number and flabellum 11 of the guide vane 121 of stator blade 12 prime number each other.It can be with from Fig. 2 b
Find out, stator blade 12 includes eight guide vanes 121, this eight guide vanes 121 are evenly distributed, i.e., is between two neighboring guide vane 121
45 ° of angle.The angle of two neighboring guide vane 121 refers to the radial outer end of two neighboring guide vane 121 to the center of inner ring 122
Line between angle.
Inventor has found after research and testing, by changing the arrangement of flabellum blade and stator blade guide vane in a certain way,
It can reduce the noise of cooling fan.It will be described in more detail below.
Fig. 3 shows cooling fan 20 according to an embodiment of the present invention, wherein cooling fan 20 include flabellum 21, stator blade 22 with
And motor 23, motor 23 are mounted on stator blade 22, flabellum 21 is mounted on motor 23, and flabellum 21 can be revolved relative to stator blade 22
Turn.When motor 23 is powered, motor 23 drives the rotation of flabellum 21 to generate air stream, and air stream is then by keeping in solid
Determine the stator blade 22 of state.The panel 24 of cooling fan 20 is also shown in Fig. 3, which is assembled to vapour via panel 24
Around car engine (not shown), and constitute a part of car engine cooling system.It is cold in addition to flabellum 21 and stator blade 22
But the motor 23 in fan 20 and panel 24 in cooling fan 10 motor 13 and panel 14 it is identical, omit its description herein.
As shown in FIG. 3, flabellum 21 includes seven blades 211, is equipped with (the figure of wheel hub 212 in the radial inner end of blade 211
Wheel hub 212 is more clearly illustrated in 4a).It is equipped with integral shroud 213 in the radial outer end of blade 21, blade 211 is connected to 212 He of wheel hub
Between integral shroud 213.When cooling fan 20 works, motor 23 rotates, and the wheel hub 212 being mounted on motor 23 is driven to rotate, from
And the blade 211 connecting with wheel hub 212 is promoted to rotate.Flabellum 21 will be described in detail in conjunction with Fig. 4 a.
Stator blade 22 includes eight guide vanes 221, is equipped with inner ring 222 in the radial inner end of guide vane 221, and in guide vane 221
Radial outer end is equipped with outer ring 223, and guide vane 221 is connected between inner ring 222 and outer ring 223.Outer ring 223 is connected to cooling fan
20 panel 24, thus makes stator blade 22 be fixed and remain stationary in cooling fan 20.Inner ring 222 plays fixed and keeps electricity
The effect of machine 23, and inner ring 222 is connected to outer ring 223 via guide vane 221.Stator blade 22 will be described in detail in conjunction with Fig. 4 b.
Fig. 4 a shows the flabellum 21 of the cooling fan 20 in Fig. 3.Can be seen that flabellum 21 from Fig. 4 a includes seven blades
211, this seven blades 211 are in non-uniform Distribution, i.e., the angle between two neighboring blade 211 is non-uniform.
Specifically, seven blades of flabellum 21 are respectively 211a, 211b, 211c, 211d, 211e, 211f, 211g.Phase
The angle of neighbour two blades 211a, 211b refer to the radial outer end of blade 211a to center (the i.e. rotation of flabellum 21 of wheel hub 212
The intersection point of plane where shaft axis and flabellum) line, with the line of the radial outer end of blade 211b to the center of wheel hub 212 it
Between angle, the angle is indicated by α 1 in fig.4.Correspondingly, the angle of two neighboring blade 211b, 211c are indicated by α 2, phase
The angle of neighbour two blades 211b, 211c are indicated that the angle of two neighboring blade 211c, 211d are indicated by α 4 by α 3, adjacent two
The angle of a blade 211d, 211e are indicated that the angle of two neighboring blade 211e, 211f are indicated by α 6, two neighboring leaf by α 5
The angle of piece 211f, 211g are indicated by α 7.By changing α 1 to α 7, so that blade 211 is in non-uniform Distribution.Preferably, cold
But in fan 20, α 1 is 61.2 ° ± 1 °, and α 2 is 37.3 ° ± 1 °, and α 3 is 47.9 ° ± 1 °, and α 4 is 67.1 ° ± 1 °, and α 5 is 47.9 °
± 1 °, α 6 is 37.3 ° ± 1 °, and α 7 is 61.2 ° ± 1 °.
As described above, in cooling fan 20, it is this although α 1 to α 7 is allowed to change in corresponding angular range
Variation should meet corresponding structural requirement, i.e. the sum of α 1 to α 7 should be 360 °.In addition, although α 1 and α 7, α 2 and α 6 and α 3 and α
5 are consistent in the statement of angular range, it is not intended that α 1 and α 7, α 2 and α 6 and α 3 and α 5 must be complete or absolute
Equal.For example, for α 1 and α 7, the two can be equal or be not completely equivalent, if α 1 and α 7 be respectively at 61.2 ° ±
In the range of 1 °.
Fig. 4 b shows the stator blade 22 of the cooling fan 20 in Fig. 3, wherein removing outer ring 223 for ease of description.?
In cooling fan 20, the number of the blade 211 of the number and flabellum 21 of the guide vane 221 of stator blade 22 prime number each other.It can be with from Fig. 4 b
Find out, stator blade 22 includes eight guide vanes 221.In the present embodiment, it is two groups which, which is divided to, that is, first group of guide vane
221a and second group of guide vane 221b.First group of guide vane 221a has equally distributed four guide vanes, i.e., between two neighboring guide vane
It is in 90 ° of angle.Second group of guide vane 221b has equally distributed four guide vanes, i.e., is in 90 ° between two neighboring guide vane
Angle.The angle of two neighboring guide vane 221 refers to the radial outer end of two neighboring guide vane 221 to the center of inner ring 222
Angle between line.Second group of guide vane 221b is deflected relative to first group of guide vane 221a with 27 ° of guide vane deflection angle.Cause
This, by using the center of inner ring 222 as deflection center, between inner ring 222 and outer ring 223 by second group of guide vane 221b relative to
First group of guide vane 221a deflects 27 ° of guide vane deflection angle in the counterclockwise direction or clockwise, can obtain stator blade 22.
Although it should be noted that the guide vane deflection angle in cooling fan 20 is set as 27 ° herein, guide vane deflection angle can be
Change in the range of 27 ° ± 1 °, that is, guide vane deflection angle can be between 26 ° to 28 °.
Fig. 5 shows the harmonic noise test facilities of cooling fan.The harmonic noise test facilities include semianechoic room, wherein
It is tested in semianechoic room, and by ambient noise control at lower than 25dB (A).In addition, being set in harmonic noise test
Shi Zhong, using acoustical testing and analysis system (in this case, it is German 8.0 acoustical testing of Head Suite and analysis systems) into
Row test and analysis, and made an uproar by what microphone (in this case, it is U.S.'s PCB acoustic microphones) acquisition cooling fan generated
Sound.
Simulation cooling fan position in the car and working environment during the test, and microphone is placed on simulation
The position of occupant in automobile.Specifically, as shown in figure 5, cooling fan is positioned in the vertical direction apart from ground 0.5m,
And microphone is positioned on Z-direction (vertical direction) apart from ground 1.5m；Meanwhile microphone and cooling fan are in X-direction
At a distance of 2m on (being equivalent to longitudinal direction of car direction), it is upper that microphone with cooling fan (is equivalent to vehicular transverse direction) in the Y direction
In in the same plane vertical with Y-direction, and microphone is located at the upstream of the air stream of the generation of cooling fan 10 (that is, Mike
Wind is located at the inlet side of cooling fan).After test starts, the revolving speed n of fan 10 to be cooled stablizes in 2900rpm (that is, 2900
Rev/min) after, it is sampled with the resolution ratio of 1Hz, wherein sample frequency is 32768Hz, so as to completely acquire
The noise of (existence range of the harmonic noise of cooling fan 10) within 16000Hz.Then, data obtained are carried out quick
Fourier transformation (FFT), and test result is obtained through A note power.
Fig. 6 and Fig. 7 shows the harmonic noise test result of cooling fan, wherein and horizontal axis indicates harmonic frequency (unit Hz),
The longitudinal axis indicates A note power sound pressure level (unit dB (A)).It can be seen from figures 6 and 7 that the rotational noise of cooling fan mainly collects
In in three harmonic waves, that is, first harmonic H1, the centre second harmonic H2 of order and the third harmonic of high order of low order time
H3.In the present embodiment, for example, harmonic wave Hi=i*B*n/60, wherein i=1,2,3, B be the number of flabellum blade, and n is flabellum
Revolving speed.When it is 2900rpm that B, which is 7, n, first harmonic H1 is 338Hz, and second harmonic H2 is 677Hz, and third harmonic H3 is
1015Hz.The noise of corresponding harmonic wave is indicated by the sound pressure level amplitude at corresponding harmonic wave.
Correspondingly, in the harmonic noise test result of cooling fan 10 shown in Fig. 6, pass through the sound at first harmonic H1
Amplitude of arbitrarily downgrading (hereinafter referred to as the first noise) N1 indicates the noise of first harmonic H1, passes through the sound pressure level width at second harmonic H2
Value (hereinafter referred to as the second noise) N2 indicates the noise of second harmonic H2, by sound pressure level amplitude at third harmonic H3 (with
It is known as third noise down) N3 indicates the noise of third harmonic H3.The harmonic noise of cooling fan 20 shown in Fig. 7 tests knot
It is and described in reference diagram 6 similar in fruit, by sound pressure level amplitude (hereinafter referred to as the first noise) N1 ' at first harmonic H1 come
The noise for indicating first harmonic H1, is indicated by sound pressure level amplitude (hereinafter referred to as the second noise) N2 ' at second harmonic H2
The noise of second harmonic H2 indicates third by sound pressure level amplitude (the hereinafter referred to as third noise) N3 ' at third harmonic H3
The noise of harmonic wave H3.
Table 1 shows the harmonic noise test result of cooling fan 10 and 20 obtained.As shown in table 1, for cooling
Fan 10, the noise N1 at first harmonic H1 are 59.84dB (A), and the noise N2 at the place second harmonic H2 is 51.10dB (A), third
Noise N3 at harmonic wave H3 is 44.72dB (A)；And for cooling fan 20, the noise N1 ' at first harmonic H1 is 43.21dB
(A), the noise N2 ' at second harmonic H2 is 43.51dB (A), and the noise N3 ' at third harmonic H3 is 39.00dB (A).With it is existing
There is technology cooling fan 10 to compare, cooling fan 20 according to an embodiment of the present invention reduces the noise at first harmonic H1 (i.e.
Optimum level is) 16.63dB (A), the amplitude that reduces is 28%；Noise at second harmonic H2 is reduced into 7.59dB (A), reduces width
Degree is 15%；Noise at third harmonic H3 is reduced into 5.72dB (A), the amplitude that reduces is 13%.
The harmonic noise test result of 1 cooling fan 10 and 20 of table
| Unit: dB (A) | H1 | H2 | H3 |
| Cooling fan 10 | 59.84 | 51.10 | 44.72 |
| Cooling fan 20 | 43.21 | 43.51 | 39.00 |
| Optimum level | 16.63 | 7.59 | 5.72 |
In embodiment as described above, flabellum 21 includes seven blades 211 in non-uniform Distribution, and by stator blade 22
Including eight guide vanes 221 to be divided to be two groups, every group of guide vane 221 includes equally distributed four guide vanes, and two groups of guide vanes are to be situated between
Guide vane deflection angle deflection between 26 ° to 28 °.By making flabellum 21 include seven blades 211 in non-uniform Distribution, adjust
The circumferentially distributed position of the blade 211 of flabellum 21 is controlled, so that the angle between blade 211 is in non-uniform Distribution, to change
Phase angle guarantees that the noise generated when cooling fan 20 rotates is not superimposed in a harmonic order, harmonic components is promoted to shift
Onto other orders, harmonic noise is thus reduced.But due to the limitation of width of blade, which is only capable of reducing to a certain extent
Such as the noise of second harmonic H2 and third harmonic H3, the noise of first harmonic H1 cannot be optimized well.It is basic herein
On, the guide vane dipole sound radiant theory based on stator blade 22 establishes the guide vane deflection angle and harmonic noise width of two groups of guide vanes 211
Relationship between value, and then (every group includes 4 and leads by making two groups of guide vanes 221 of stator blade 22 with suitable guide vane deflection angle
Leaf) it deflects relative to each other to decay to the amplitude of target harmonic noise.
By the cooperation of above-mentioned arrangement, the noise of second harmonic H2 and third harmonic H3 can not only be reduced, and first is humorous
The noise of wave H1 can be also effectively reduced, so that the noise of cooling fan be effectively reduced on the whole.Therefore, according to the disclosure
Above-mentioned aspect cooling fan in, the stator blade of cooling fan, which not only serves, to be supported and fixed, but also and non-uniform Distribution
Flabellum blade cooperate to reduce harmonic noise.
It is illustrated above that but the embodiment is merely exemplary and not restrictive according to one embodiment of present invention,
It without departing from the spirit of the scope of the invention, can also be in other embodiments using the present invention.
In cooling fan 20, flabellum 21 includes integral shroud 213, but in other embodiments, the radial outer end of blade can
To be not provided with integral shroud, only the radial inner end of blade is connected to wheel hub.
In cooling fan 20, stator blade 22 includes outer ring 223, which is the individual component relative to panel 14,
But in some embodiments, outer ring can be integrally formed with panel.
In cooling fan 20, stator blade 22 includes the inner ring 222 of disc or circular ring shape, but in some embodiments,
Inner ring is not limited to the shape of disc or circular ring shape, as long as inner ring is capable of fixing and keeps motor.
The blade of flabellum can have various aerofoil profiles, including but not limited to symmetrical airfoil, biconvex profile, plano-convex aerofoil profile, recessed
Convex wing type, flat profile, arc plate aerofoil profile etc..
Flabellum can be made of metal material or plastic material, and metal material includes in the metallic elements such as iron, aluminium, magnesium, copper
One or more alloys, plastic material includes polybutylene terephthalate (PBT) (PBT), polycarbonate (PC), acrylonitrile-
Butadiene-styrene (ABS), polypropylene (PP) etc..In view of manufacturing cost, flabellum can be preferably made of plastic material.
The guide vane of stator blade can have circle, ellipse, rectangle, diamond shape iso-cross-section shape, and can be in U-shape, is empty
The forms such as the heart, solid.
Stator blade can be made of metal material or plastic material, and metal material includes in the metallic elements such as iron, aluminium, magnesium, copper
One or more alloys, plastic material includes polybutylene terephthalate (PBT) (PBT), polycarbonate (PC), acrylonitrile-
Butadiene-styrene (ABS), polypropylene (PP) etc..In view of manufacturing cost, stator blade can be preferably made of plastic material.
According to various embodiments of the present invention, the arrangement of the blade of flabellum can be applied to have various wheel hub ratios
Flabellum, correspondingly, the arrangement of the guide vane of stator blade can be applied to the stator blade with various wheel hub ratios.
Another embodiment of the disclosure provides a kind of car engine cooling system, the car engine cooling system packet
Include the cooling fan of the present embodiment.
The flabellum blade of the present embodiment and the arrangement of stator blade guide vane can be also applied in the design of other turbine types, as long as
On the direction for the air stream that turbine type design generates, stator blade guide vane is located at the downstream of flabellum blade.
Claims (9)
1. a kind of cooling fan, comprising:
Flabellum, the flabellum include seven blades in non-uniform Distribution；With
Stator blade, the stator blade are configured such that the flabellum can be rotated relative to the stator blade,
It is characterized by:
The stator blade includes first group of guide vane and second group of guide vane, wherein in first group of guide vane and second group of guide vane
Each group of guide vane all has equally distributed four guide vanes, and second group of guide vane relative to first group of guide vane to be situated between
Guide vane deflection angle deflection between 26 ° to 28 °.
2. cooling fan according to claim 1, wherein second group of guide vane is relative to first group of guide vane with 27 °
Guide vane deflection angle deflection.
3. cooling fan according to claim 1 or 2, wherein the folder between two neighboring blade in seven blades
Angle be followed successively by 61.2 ° ± 1 °, 37.3 ° ± 1 °, 47.9 ° ± 1 °, 67.1 ° ± 1 °, 47.9 ° ± 1 °, 37.3 ° ± 1 ° and 61.2 ° ±
1°。
4. cooling fan according to claim 1 or 2, wherein the guide vane has round, ellipse, rectangle or diamond shape horizontal
Cross sectional shape, and be in U-shape, hollow or solid form.
5. cooling fan according to claim 1 or 2, wherein the blade has symmetrical airfoil, biconvex profile, the plano-convex wing
Type, concave-convex aerofoil profile, flat profile or arc plate aerofoil profile.
6. cooling fan according to claim 1 or 2, wherein the blade with or without integral shroud.
7. cooling fan according to claim 1 or 2, wherein the flabellum is made of metal material or plastic material, institute
Stating metal material includes one of iron, aluminium, magnesium, copper metal element or a variety of alloys, the plastic material include PBT, PC,
ABS or PP.
8. cooling fan according to claim 1 or 2, wherein the stator blade is made of metal material or plastic material, institute
Stating metal material includes one of iron, aluminium, magnesium, copper metal element or a variety of alloys, the plastic material include PBT, PC,
ABS or PP.
9. a kind of car engine cooling system, including cooling fan described in one according to claim 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035956.3A CN110043515B (en) | 2018-01-15 | 2018-01-15 | Cooling fan with low harmonic noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035956.3A CN110043515B (en) | 2018-01-15 | 2018-01-15 | Cooling fan with low harmonic noise |
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| CN110043515A true CN110043515A (en) | 2019-07-23 |
| CN110043515B CN110043515B (en) | 2023-07-18 |
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| CN201810035956.3A Active CN110043515B (en) | 2018-01-15 | 2018-01-15 | Cooling fan with low harmonic noise |
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| CN111174280A (en) * | 2020-02-26 | 2020-05-19 | 广东美的制冷设备有限公司 | Wind-guiding stationary blade, wind channel part and air conditioner |
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| CN110043515B (en) | 2023-07-18 |
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